Guide for tube-making machines



R. 0. BERG.

GUIDE FOR TUBE MAKING MACHINES.

Patented May 24, 1921.

2 SHEETS-SHEET I- Sal! R. O. BERG.

GUIDE FOR TUBE MAKING MACHINES. APPLICATION FILED JUNE 3. |920.

1,378,992. Patented May 24, 1921.

M I gmmm 62; @23%. i M

UNITED STATES PATENT or-ElcE PRODUCTS COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

GUIDE FOR TUBE-MAKING MACHINES.

Specification of Letters Patent.

Patented May-24, 1921.

Application med'xunef 3, 1920. serial no. 386.403.

been quite usual to provide some kind of a projecting fin or blade that engaged between the opposed edges of the split tubing to prevent twisting of the tubing as the same is being fed to the torch or electrodes. It has also been proposed to use a peripheral lin on one of the feed rolls for this purpose.

It is the object of the present invention to so arrange the combination of feed rolls,

. the fin, and mandrel, that" the same all cooperate at one point not only to revent the tube from being twisted torsiona ly but also to make the opposed edges of the rsplit tubing substantiallyregister.

It is a further object of the present invention'to provide a support for the combined lin and mandrel which will give it a uniy versal adjustment within given limits to accommodate itself to varying requirements.

In the drawings,-

Figure 1 is a vertical section through a pair of feed rolls in a tube welding machine showing the torch, the feed rolls, and my improved mandrel.

Fig. 2 is a cross section on the line 2 2 of Fig. 1.

Fig. 3 is a plan view of the upper feed roll and improved mandrel taken as a section on the line 3--3 of Fig. 1.

Fig. 4 is a section taken on the line 1-AA of Fig. 1.

Heretofore the most commonl wayof guiding the split of the split tubing directly under the welding torch has been to use a peripheral fin on one of the feed rolls. This form of guide, however, makes no provision for lining up Athe edges of the tubing into correct registry with each other. Furthermore, this form of roll is somewhat expensive to construct and when the guiding fin gives out the roll assembly has to be taken apart, the roll removed, and a new one lport the fin on the mandrel carrier.

inserted, resulting in rather expensive repair work. This form 0f roll is obviated by my improvement. In place of using such a roll, I use'a grooved feed roll a provided with an annular groove b. This feed roll is mounted in the usual way between the posts nc, c. A pair of clamping bars d, al. can be bolted to each of these posts by the cap screws e. These are adapted to clamp the T shaped mandrel carrier f tothe face of the posts. By comparing Figs. 1 to 4 it will be seen that the cap screws e do not ptss through the T shaped mandrel carrier. ence vbyloosening the clamping bars the T shaped mandrel carrier may be adjustable either u wardly or laterally, giving a universal a justment within certain limits. The pins g pass through thel mandrel carrier and through the fin h, serving to sup- Similarly pins i pass through the mandrel and the fin. It will be noticed that the forward end of the fin -is narrowed as at y' and the fin and the mandrel are located between the upper and lower feed rolls.. This portion of the fin not onl accomplishes what was heretofore accomp ished by the fin on the upper feed roll but the mandrel o erating in conjunction with the two fee rolls serves to cause the two edges ofthe split g RICHARD O. BERG, OF DETROIT, MICHIGAN, ASSIGNOR TO MICHIGAN STEEL TUBE tubing to register. ObviouslyI the edges of lthe tubing cannot get outI of suitable registry by one drop ing below the other because; the mandre prevents this, and the two edges cannot et out of substantial registry by one of t e edges springing outwardly because the feed rolls prevent this.

Hence this combination of mandrel, fin, and feed lroll accomplishes. not only the function of a guide against twisting but also properly secures re istry between the meet- 111g edges of the tu ing.

t will readily be seen that in case the mandrel becomes damaged the same may be easily removed and replaced' or another mandrell ma be placed in the machine for tubing of di erent sizes sim ly by unloosening t e clamping bars. is does not reqtllure the rolls to be disturbed for repairing t e iding element.

W at I claim is:

1. A guiding device for a tube making machine, having in combination, a pair of feed rolls, a guiding fin, and a mandrel su ported adjacent the feed rolls with both tilfe guiding fin and the mandrel running between the feed rolls.

2. A guiding device for a tube making machine, having in combination, a pair of feed rolls, the upper one of which is rovided with anannular groove, a gui ing fin, and a mandrel running between the feed rolls and the guiding iin engaging in the said groove of the upper feed roIl.

3. A guiding device for a tube making machine, comprising a fin adaptedto be engaged in the slot of the split tubing, a mandrel supported thereby adapted to engage in the interior of the split tubing, and means engaging the exterior of the tubing directly above the mandrel and iin for preventing the edges of the tubing springing out of substantlal registry.

4. A guiding device for a tube making machine, comprising a support, a fin and mandrel, a carrier therefor, and a clamping device for jamming the carrier against the support but permitting the carrier to be adjusted in any direction within given limits. 4

5. A guiding device for a tube making machine, comprising a post, afin, a carrier for the n, and a clamping device for frictionally engaging the carrier and jamming the same against the post to permit the universal adjustment of the carrier within given limits when the clamping device is released.

6. A guiding device for a tube making machine, comprising a 1in, a carrier therefor,

a post, a. clamping device comprising a pair of bars adapted to engage the-carrier and having screws engaging the posts by which the bars may be jammed against the carrier to jam the latter against the post to permit universal adjustment of the carrier when the clamping bars are released.

7. A guiding device for a tube making machine, comprising a n, a carrier of T shape when viewed in plan, a pair of vertical clamping bars, a post, and screws by which the clamping bars may be jammed against the ends of the bar -of the T to hold the carrier to the post.

8. A guiding device for a tube making machine, comprising a pair of rolls one of which has an annular groove, a carrierand a n supported between the rolls inthe groove of the one roll by the said carrier.

In testimony whereof I aiix my si ature.

RICHARD O. B RG. 

